IET continues to produce the 1413 Series Decade Capacitor to the same
exacting specs as GenRad. The GenRad 1413 Precision Decade Capacitor is both
a high-quality, wide-range standard and a reliable component for systems. It
can be used as a bench model for versatility, or it can be
rack-mounted.

This six-decade capacitor features fine adjustment over a
wide range of capacitance, with excellent accuracy. Any value in the range of 0
to 1.111 11 μF can be set, with a resolution of 1 pF. For a wider range up to
10,000 μF with similar performance consider the HASC-Z Decade Capacitor

Six
precision decades are employed to provide a range of 0 to 1.11111 µF in
increments of 1 pF and with an accuracy of 0.05% +0.5pF. Air capacitors are used
for the two lower decades and highest grade mechanically stabilized sealed India
Ruby mica capacitors are used for the remainder. Air trimmers are used for
trimming the two lowest silvered-mica decades. The stability of the 1413 is such
that it should not require readjustment with normal service. However, should it
become desirable,the four lower decades contain trimmer capacitors that are
accessible for this purpose.

The connections to the inner shield and to
the case are shown in Figure 1-1 (on datasheet). Low terminal-to-guard and
detector-input capacitances are obtained by dividing the shielding into two
parts. When the two parts are connected together, the 1413 becomes a
well-shielded three-terminal capacitor with extremely low zero capacitance. The
connections are made by means of BNC connectors on the front of the cabinet
(Rear output or 874 connectors are also available). The inner contacts provide
the connections to the capacitors. The outer shells connect to the shields and,
when connected together, form the third terminal of the capacitor.

To
improve the resolution from 1 pF on the 1413 consider adding the optional
HACS-Z 1pF
Trimmer